System for pneumatically conveying bulk particulate materials

ABSTRACT

A system for pneumatically conveying a bulk particulate material generally consisting of means for holding such material, having an inlet and an outlet; a first material transport line segment including a first conduit formed of a gas permeable material having an inlet communicating with the outlet of the holding means and an outlet, defining a material flow passageway, and a second conduit formed of a gas impermeable material spaced from and encompassing the first conduit, defining a plenum; a second material transport line segment including a first conduit formed of a gas permeable material having an inlet communicating with the outlet of the first conduit of the first segment, defining a continuation of the material flow passageway, and an outlet, and a second conduit section formed of a gas impermeable material spaced from and encompassing the first conduit thereof, defining a plenum; the second segment being displaceable relative to the first segment between a first position communicating the outlet of the first conduit of the second segment with a receptacle into which the material is to be conveyed, and a second position communicating the outlet of the first conduit of the second segment with the inlet of the material holding means; means for supplying gas under pressure to the plenums, causing such gas to penetrate the first conduits to fluidize material flowing in the passageways and means for inducing the flow of material in the passageways, causing material induced therein from the holding means to be impelled therethrough.

[0001] This invention relates to a system for pneumatically conveyingbulk particulate materials, and more particularly to such a system whichmay be operated to purge residual material remaining in the transportline thereof following a shutdown of the system.

BACKGROUND OF THE INVENTION

[0002] In a typical system for pneumatically conveying bulk particulatematerials from a first site to a second site, there is provided amaterial feed receptacle located at the first site, a material receivingreceptacle located at the second site, a transport line receivingmaterial from the feed receptacle and guiding it to the receivingreceptacle and means for injecting air under pressure into the transportline to impel the material fed therein. Such receptacles at either ofsuch sites may consist of storage vessels, processing equipment andvarious other modes of transportation including truck bodies, railwaycars and ship holds.

[0003] Often, when the operation of such a system is shut down, acertain amount of material remains in the transport line which may beundesirable. Such condition could result in a distortion of measuredamounts of the material being conveyed, a possible degradation of theresidual material, a settling of the material causing subsequentblockage of the transport line and depending upon the material beingconveyed, a possible undue deterioration of the transport line.Accordingly, it is the principal object of the present invention toprovide a system for pneumatically conveying bulk particulate materialsin which residual material in the transport line thereof may be readilypurged upon shutdown of the system.

SUMMARY OF THE INVENTION

[0004] The present invention overcomes the problem of the deleteriouseffects of residual material remaining in the transport line of apneumatically conveying system by providing a transport line thereofwhich is operable to return such residual material to the feedreceptacle. This is accomplished by providing a transport line whicheither is provided with permanent means for returning such material tothe feed receptacle or can be reconfigured to return such material.

BRIEF DESCRIPTION OF DRAWINGS

[0005]FIG. 1 is a side elevational view of a system for pneumaticallyconveying bulk particulate materials, illustrating the system in aconfiguration for returning material in the transport line to a materialfeed receptacle;

[0006]FIG. 2 is a side elevational view of the embodiment shown in FIG.1, illustrating the system configured for conveying material to a remotematerial receiving receptacle;

[0007]FIG. 3 is an enlarged view of a connection of segments of thetransport line of the system shown in FIGS. 1 and 2, illustrating themanner in which the transport line may be reconfigured between thematerial conveying and material return modes of the system;

[0008]FIG. 4 is an enlarged, vertical cross-sectional view of theportion of the transport line designated by the reference numeral 4 inFIG. 1;

[0009]FIG. 5 is a side elevational view of another system forpneumatically conveying bulk particulate materials embodying the presentinvention, illustrating the transport line thereof configured to returnresidual material therein to the material feed receptacle;

[0010]FIG. 6 is a side elevational view of the system shown in FIG. 5,illustrating the transport line thereof configured to convey material toa remote material receiving receptacle;

[0011]FIG. 7 is a side elevational view of a system for pneumaticallyconveying bulk particulate materials, having the capability ofalternately conveying material to a remote material receiving receptacleand returning residual material in the transport line to the feedreceptacle;

[0012]FIG. 8A is an enlarged, cross-sectional view of the portion of thetransport line of the system shown in FIG. 7, designated by thereference numeral 8, illustrating the position of a diverter valvecausing residual material in the transport line to be returned to thefeed receptacle; and

[0013]FIG. 8B is a view similar to the view shown in FIG. 8A,illustrating the position of the diverter valve in the transport linefor conveying material to the remote material receiving receptacle.

DETAILED DESCRIPTIONS OF SEVERAL EMBODIMENTS OF THE INVENTION

[0014] Referring to FIGS. 1 through 3 of the drawings, there isillustrated a system 10 embodying the present invention. Generally, thesystem includes a vessel 11 in which a bulk particulate material to beconveyed is stored, and a transport line 12. The vessel generally is ofa conventional configuration including a cylindrical, main body section13, an upper inlet section 14 and a lower outlet section 15. The lower,outlet section has an inverted, frusto-conical configuration with adischarge outlet at the lower end thereof. As best shown in FIG. 1, theinterior of lower, outlet section 15 is provided with an inverted,frusto-conically configured wall member 16 formed of a gas permeablematerial and spaced from section 15 to provide a plenum 17 therebetween.Air under pressure is supplied to plenum 17 through an inlet 18, whichis caused to flow through permeable wall member 16 to fluidize materialdeposited in lower section 15 of the vessel and thus enhance theflowability of the material in the vessel through the lower outletthereof.

[0015] Transport line 12 generally includes a lower, base segment 19permanently connected to the lower end of the vessel, and an uppersegment 20 detachably connected to the free end of lower, base section19. Base section 19 consists of a number of units 21, 22 and 23 joinedtogether in end-to-end relation. As best shown in FIG. 4, unit 21includes an inner conduit 24 formed of a gas permeable material,defining a fluid passageway 25 having an inlet communicating with theoutlet of vessel section 15 and an outlet, and an outer conduit 26formed of a gas impermeable material and spaced from and encompassinginner conduit 24 to form a plenum 27. One end of outer conduit 26 isconnected to vessel section 15 and the other end thereof is providedwith an annular flange 28 which serves as an end wall of plenum 27.

[0016] Disposed between vessel section 15 and line section 21 is a flowcontrol valve 29 which may be opened to permit material in vessel 11 togravity flow into material passageway 25 of line section 21. Such valvemay consist of a slide valve or a rotary valve: Material gravity fedfrom vessel 11 into material passageway 25 is caused to flowtherethrough by means of a nozzle 30 having an inlet communicating witha source of air under pressure and an outlet communicating with materialpassageway 25. Such material flow in passageway 25 is enhanced by thesupply of air under pressure through an inlet 31 into plenum 27 whichpermeates inner conduit 24 to provide a fluidized boundary layer alongthe interior of inner conduit 24.

[0017] Line section 22 is similar to line section 21, consisting of aninner conduit 32 formed of a gas permeable material and defining acontinuation of passageway 25, an outer conduit 33 formed of a gasimpermeable material, spaced from and encompassing inner conduit 32 toprovide a plenum 34, an annular flange 35 forming an end wall of plenum34 and mating with annular flange 28 of line section 21 and an annularflange comparable to annular flange 28 which forms an end wall of plenum34 and mates with an annular flange of line section 23, comparable toannular flange 35. Air under pressure is supplied through an inlet 36 toplenum 34 which permeates inner conduit 32 to form a fluidized boundarylayer similar to the fluidized boundary layer formed in line section 21to enhance the flow of material in the passageway of line section 22.Line section 23 is essentially similar to line section 22 inconstruction and function. It too provides a continuation of materialpassageway 25 and is provided with an inlet 37 through which air underpressure is supplied to the plenum thereof for forming a fluidizedboundary layer within the inner conduit of such section.

[0018] Transport line segment 20 consists of a base section 40, a pairof intermediate sections 41 and 42 and a discharge section 43, each ofwhich sections includes an inner conduit formed of a gas permeablematerial communicating with and forming a continuation of passageway 25,and an outer conduit formed of a gas impermeable material spaced fromand encompassing the inner conduit thereof to form a plenum. Each ofsuch plenums is closed at the ends thereof and is provided with an inletconnected to a source of air under pressure. Air supplied to suchplenums similarly permeates the inner conduits of such segment to form afluidized boundary layer in the material passageway to similarlyfacilitate the flow of material being conveyed therethrough.

[0019] The mating flanges of the conduit sections of segments 19 and 20may be joined together by any suitable means including welding, boltingand clamping. Since line segment 20 is intended to be detached andrepositioned relative to line segment 19, as illustrated in FIG. 3,annular flange 40 a of conduit section 40 is either clamped or bolted toannular flange 23 a of conduit section 23 when such flanges are matedtogether as shown in FIGS. 1 and 2.

[0020] The lengths, configurations and interrelationships of thetransport line segments are designed to permit segment 20 to be arrangedin a first position relative to segment 19, positioning the outlet ofdischarge conduit section 43 in communication with the inlet of areceptacle into which material stored in vessel 11 is to be conveyed, asshown in FIG. 2, and a second position relative to segment 19,positioning the outlet of discharge conduit section 43 in communicationwith the inlet of vessel section 14, to purge material from thetransport line and convey such material back into vessel 11, as shown inFIG. 1. In the specific embodiment shown in FIGS. 1 through 4, conduitsection 21 is substantially horizontal with a curved end sectionconnected to flow control valve 29, conduit sections 22 and 23 aredisposed at an angle of approximately 60° and conduit sections 41 and 42are disposed substantially horizontally or at an angle of approximately120°0 relative to conduit sections 22 and 23, when the system is in thematerial conveying and loading mode, and sections 41 and 42 are disposedat an angle of approximately 240° relative to sections 22 and 23 whenthe system is in the line purging mode as shown in FIG. 1.

[0021] When it is desired to operate the system shown in FIGS. 1 through4 to convey material from vessel 11 through transport line 12 and loadsuch material in a selected container, the transport line is configuredas shown in FIG. 2, air under pressure is supplied to the plenums of theconduit sections to form a fluidized boundary layer along the materialpassageway of the transport line, a high velocity stream of air isinjected into such passageway through nozzle 30, valve 29 is opened toallow material from the vessel to gravity flow into the transport lineand be entrained in the motive air injected into the transport line, andair under pressure is applied to the plenum in lower section 15 of thevessel to form a fluidized boundary layer along permeable wall section16 to facilitate the gravity flow of material from the vessel to thetransport line. When the desired amount of material has been conveyedand loaded in the selected receptacle, and it is desired to shut downthe system, the control valve is closed, the fluidizing air supply andmotive air injection is discontinued, line section 20 is disconnectedfrom line section 19, repositioned from the position shown in FIG. 2 tothe position shown in FIG. 1 and reconnected to segment 19 and motive ofair is then injected through nozzle 30 to purge residual material in thetransport line and return it to vessel 11. Depending on the size of thesystem, the repositioning of segment 20 may be performed manually orthrough the use of a hoist.

[0022] Referring to FIGS. 5 and 6, there is illustrated a system 50consisting of another embodiment of the invention. The system is similarto the system shown in FIGS. 1 through 4 and includes a material storagevessel 51 comparable to vessel 11 and a material transport line 52consisting of line segments 53 and 54, similar to transport line 12 withthe exception of the means provided for connecting line segment 54 toline segment 53. Line segment 54 is swivelly connected to line segment53 so that line segment 54 may be swiveled between the conveying andloading position as shown in FIG. 6 and the material return position asshown in FIG. 5. Line section 54 may be repositioned relative to linesegment 53 manually, manually through the assistance of a hoist assemblyor mechanically through the use of a motor mounted on segment 53operatively connected to segment 54 through a suitable gearingarrangement. The lengths, configurations and interrelationships of theline segments similarly may be designed to permit the outlet of segment54 to be positioned to communicate with a selected receptacle during theconveying and loading mode of the system and, alternatively, thepositioned to communicate with the inlet of vessel 51 during the purgingmode of the system.

[0023] In the operation of the system shown in FIGS. 5 and 6, when it isdesired to convey and load material into a selected receptacle, thetransport line is configured as shown in FIG. 6, fluidizing air issupplied to the transport line and motive air is injected into thepassageway of the line, control valve 55 is opened to allow the gravityflow of material from the vessel into the transport line to be entrainedand conveyed therein and fluidizing air is supplied to the lower sectionof the vessel to enhance the gravity flow of material from the vessel tothe transport line. When the loading of the material has been completedand it is desired to shut down the system, control valve 55 is closed,the supply of fluidizing air and the injection of motive air isdiscontinued, the transport line is reconfigured from the configurationshown in FIG. 6 to the configuration shown in FIG. 5 simply by swivelingline section 54 relative to line section 53 about an axis coincidingwith the longitudinal center line of line section 54 and then injectingmotive air through nozzle 56 to purge material from the transport lineand redeposit it in vessel 51. The manner in which line segment 54 isswiveled relative to line segment 53 will depend on the size and weightof the segments. In smaller, comparatively lighter transport lines, linesegment 54 perhaps may be swiveled manually. In larger, heaviertransport lines, a hoist device or mechanical means may be required toswivel line segment 54.

[0024]FIGS. 7, 8A and 8B illustrate a still further embodiment of theinvention. The embodiment consists of a system 60 including a materialstorage vessel 61 and a material transport line 62. Vessel 61 also issimilar to storage vessel 51 described in connection with the firstembodiment, and transport line 62 is similar in construction andfunction to transport line 52 with the exception of providing anadditional line segment in lieu of having one of the segmentsdisplaceable relative to another segment thereof. Specifically,transport line 62 includes a base segment 63, a first branch segment 64and a second branch segment 65. Base segment 63 is comparable inconstruction and function to line section 22 of the system shown inFIGS. 1 through 4, and branch segment 64 is similar in construction andfunction to line segment 20 of such system with the exception of beingpermanently connected to the end of base segment 63 in lieu of beingdisplaceable relative thereto. Branch section 65 is similar inconstruction to branch segment 64 and interconnects an intermediateportion of base section 63 with the inlet of vessel 61. Referring toFIGS. 8A and 8B, it will be seen at base segment 63 includes a materialpassageway 63 a defined by inner, gas permeable conduit 63 b, branchsegment 64 includes a material flow passageway 64 a forming acontinuation of material flow passageway 63 a, defined by inner gaspermeable conduit 64 b and branch segment 65 includes a material flowpassageway 65 a defined by gas permeable conduit 65 b which communicateswith material flow passageway 63 a. Provided at the juncture of thebranch segments, is a diverter valve 66 which functions to divert theflow of material from passageway 63 a to continuing passageway 65 a whenin the position as shown in FIG. 8A, and to cause material flowing inpassageway 63 a to continue to flow in passageway 64 a when in theposition as shown in FIG. 8B.

[0025] In the use of the system shown in FIGS. 7, 8A and 8B to conveyand load material into a selected receptacle, diverter valve 66 isoperated to position it as shown in FIG. 8B, fluidizing air is suppliedto the line segments, motive air is injected into the material flowpassageway of line segments 63 and 64, valve 67 is opened to allowmaterial in vessel 61 to gravity flow into the passageway of linesegment 63 to be entrained in the high velocity air injected into suchpassageway, and fluidizing air is supplied to the lower section of thevessel to enhance the gravity flow of material being discharged from thevessel. After the desired amount of material has been conveyed from thestorage vessel and loaded into the selected receptacle, and it isdesired to discontinue the operation and close down the system, controlvalve 67 is closed to discontinue the flow of material into thetransport line, diverter valve 66 is operated to position it as shown inFIG. 8A and the motive air injected into the transport line is allowedto continue to purge the residual material in the material flowpassageway by causing it to flow through passageway 65 a of branch line65 and be discharged into the upper end of vessel 61. Once the transportline has thus been purged, the fluidizing air supply and motive airinjection may be discontinued to correspondingly shut down the system.

[0026] Although the several embodiments of the invention as describedhave been described as having a single nozzle for injecting a highvelocity stream of air into the material flow passageway of thetransport line to provide the motive force in conveying the material, itis to be understood that additional such nozzles may be employed toimpel the material in the flow passageway of the transport line,particularly where the material flow passageway changes direction.Examples of such additional nozzles for providing additional motiveforce are nozzle 31 a in the embodiment shown in FIGS. 1 through 4,nozzle 56 b of the embodiment shown in FIGS. 5 and 6 and nozzles 68 a,68 b and 68 c in the embodiment shown in FIGS. 7 through 8B. Inaddition, although the segments of the transport lines of the severalembodiments have been described as providing inner permeable conduitsdefining the material flow passageway in the line and a plurality ofplenums into which pressurized air may be supplied, impermeable conduitsmay be employed defining the material flow passageway, and inapplications utilizing a gas permeable inner conduit defining thematerial flow passageway, a single plenum may be employed into whichpressurized air may be supplied to permeate the inner conduit and thusform a fluidized boundary layer in the material flow passageway.

[0027] The transport lines of the described embodiments may be utilizedto convey both particulate materials from a first site to a second siteand also to purge material in the line and return it to the first siteupon shutdown of the system. Either of such sites may consist of amaterial storage vessel, some mode of transportation such as a truckcontainer, a railway car and a ship's hold or a process apparatus. Thetransport line not only permits the conveyance of precise measuredamounts of material but assures removal of residual material in thepassageway thereof which could degrade, cause subsequent blockage in thesystem or cause deterioration of the line components, depending on thenature of the material used with the system.

[0028] From the foregoing detailed description it will be evident thatthere are a number of changes, adaptations, and modifications of thepresent invention which come within the province of those persons havingordinary skill in the art to which the aforementioned inventionpertains. However, it is intended that all such variations not departingfrom the spirit of the invention be considered as within the scopethereof as limited solely by the appended claims.

We claim:
 1. A system for pneumatically conveying a bulk particulatematerial comprising: means for holding said material, having an inletand an outlet; a first material transport line segment including a firstconduit formed of a gas permeable material having an inlet communicatingwith said outlet of said holding means and an outlet, defining amaterial flow passageway, and a second conduit formed of a gasimpermeable material spaced from and encompassing said first conduit,defining a plenum; a second material transport line segment including afirst conduit formed of a gas permeable material having an inletcommunicating with said outlet of said first conduit of said firstsegment, defining a continuation of said material flow passageway, andan outlet, and a second conduit section formed of a gas impermeablematerial spaced from and encompassing said first conduit thereof,defining a plenum; said second segment being displaceable relative tosaid first segment between a first position communicating said outlet ofsaid first conduit of said second segment with a receptacle into whichsaid material is to be conveyed, and a second position communicatingsaid outlet of said first conduit of said second segment with said inletof said material holding means; means for supplying a gas under pressureto said plenums, causing said gas to penetrate said first conduits tofluidize material flowing in said passageways; and means for inducingthe flow of material in said passageway, causing material introducedtherein from said holding means to be impelled therethrough.
 2. A systemaccording to claim 1 wherein said flow inducing means comprises a nozzlecommunicable with a source of gas under pressure.
 3. A system accordingto claim 2 wherein said source of gas is operable to provide a gas underpressure in the range of 80 to 120 psig.
 4. A system according to claim1 wherein said first segment includes a first section and a secondsection disposed at an angle to said first section.
 5. A systemaccording to claim 4 including means for injecting a gas under pressureinto the passageway of said second section.
 6. A system according toclaim 1 wherein said first segment is permanently connected to saidholding means.
 7. A system according to claim 6 including a flow controlvalve disposed between said holding means and said first segment.
 8. Asystem according to claim 7 wherein said valve is a rotary valve.
 9. Asystem according to claim 7 wherein said valve is a slide valve.
 10. Asystem according to claim 1 wherein said holding means comprises amaterial storage vessel.
 11. A system according to claim 10 wherein saidvessel includes an inverted, frusto-conically configured lower section.12. A system according to claim 11 including means for fluidizingmaterial disposed in said lower section.
 13. A system according to claim1 wherein said second segment disposed in one of said positions may bedetached from said first segment and reattached to said first segment insaid other position.
 14. A system according to claim 1 wherein saidsecond segment is swivelly connected to said first segment.
 15. A systemfor pneumatically conveying a bulk particulate material comprising:means for holding said material, having an inlet and an outlet; a firstmaterial transport line segment including a first conduit formed of agas permeable material having an inlet communicating with said outlet ofsaid holding means and an outlet, defining a material flow passageway,and a second conduit section formed of a gas impermeable material spacedfrom and encompassing said first conduit section thereof, defining aplenum; a second material transport line segment including a firstconduit formed of a gas permeable material having an inlet communicatingwith said outlet of said first conduit of said first segment, defining acontinuation of said material flow passageway, and an outlet, and asecond conduit section formed of a gas impermeable material spaced fromand encompassing said first conduit section thereof, defining a plenum;a third material transport line segment including a first conduit formedof a gas permeable material having an inlet communicable with saidoutlet of said first conduit of said first segment, defining acontinuation of said material flow passageway, and an outletcommunicating with said inlet of said holding means, and a secondconduit formed of a gas impermeable material spaced from andencompassing said first conduit section thereof, defining a plenum;means for selectively communicating said material flow passageway ofsaid first segment with one of the material flow passageways of saidsecond and third segments; means for supplying a gas under pressure tosaid plenums. causing gas to penetrate said first conduits to fluidizematerial flowing in said passageway; and means for inducing the flow ofmaterial in said passageways, causing material introduced therein fromsaid holding means to be impelled through said passageway of said firstsegment and selectively through said passageways of said second andthird passageways.
 16. A system according to claim 15 wherein said meansfor selectively communicating said passageway of said first segment withone of said second and third passageways, comprises a diverter valve.17. A system according to claim 15 wherein said flow inducing meanscomprises a nozzle communicable with a source of gas under pressure. 18.A system according to claim 15 wherein said source of gas is operable toprovide a gas under pressure in the range of 80 to 120 psig.
 19. Asystem according to claim 15 wherein said first segment includes a firstsection and a second section disposed at an angle to said first section,and including means for injecting a gas under pressure into thepassageway of said second section.
 20. A system according to claim 15including a valve disposed between said holding means and said firstsegment.
 21. A system according to claim 15 wherein said holding meanscomprises a vessel.
 22. A system according to claim 21 wherein saidvessel includes an inverted, frusto-conically configured lower section.23. A system according to claim 22 including means for fluidizingmaterial disposed in said lower section.
 24. A transport line forpneumatically conveying a bulk particulate material from a materialholding means having an inlet and an outlet, selectively to a selectedsite and back to said holding means comprising: a first segmentincluding a first conduit formed of a gas permeable material having aninlet communicable with said outlet of said holding means, and anoutlet, defining a material flow passageway, and a second conduit formedof a gas impermeable material spaced from and encompassing said firstconduit thereof, defining a plenum: a second segment including a firstconduit formed of gas permeable material having an inlet communicatingwith said outlet of said first conduit of said first segment, defining acontinuation of said material flow passageway, and an outlet, and asecond conduit formed of a gas impermeable material spaced from anencompassing said first conduit thereof, defining a plenum; said secondsegment being displaceable relative to said first segment between afirst position wherein said outlet of said first conduit of said secondsegment is communicable with a receptacle into which said material is tobe conveyed, and a second position wherein said outlet of said firstconduit of said second segment is communicable with said inlet of saidmaterial holding means; means for supplying a gas under pressure to saidplenums, causing said gas to penetrate said first conduits to fluidizematerial flowing in said passageway; and means for inducing the flow ofmaterial in said passageway, causing material introduced therein fromsaid holding means to be impelled therethrough.
 25. A transport lineaccording to claim 24 wherein said flow inducing means comprises anozzle communicable with a source of gas under pressure.
 26. A transportline according to claim 24 wherein said first segment includes a firstsection and a second section disposed at an angle to said first section,and including means for injecting gas under pressure into the passagewayof said second conduit.
 27. A transport line according to claim 24wherein said second segment disposed in one of said positions may bedetached from said first segment and reattached to said first segment insaid other position.
 28. A transport line according to claim 24 whereinsaid second segment is swivelly connected to said first segment.
 29. Atransport line for pneumatically conveying a bulk particulate materialfrom a material holding means, having an inlet and an outlet,selectively from said holding means to a selected site and back to saidholding means comprising: a first segment including a first conduitformed of a gas permeable material having an inlet communicable withsaid outlet of said holding means and an outlet, defining a materialflow passageway, and a second conduit section formed of a gasimpermeable material spaced from and encompassing said first conduitthereof, defining a plenum; a second segment including a first conduitformed of a gas permeable material having an inlet communicable withsaid outlet of said first conduit of said first segment, defining acontinuation of said material flow passageway, and an outlet and asecond conduit formed of a gas impermeable material spaced from andencompassing said first conduit thereof, defining a plenum; a thirdsegment including a first conduit section formed of a gas permeablematerial having an inlet communicable with said outlet of said firstconduit of said first segment, defining a continuation of said materialflow passageway, and an outlet communicable with said inlet of saidholding means, and a second conduit formed of a gas impermeable materialspaced from and encompassing said first conduit thereof, defining aplenumn; means for selectively communicating said material flowpassageway of said first segment with one of the material flowpassageways of said second and third segments; means for supplying a gasunder pressure to said plenums, causing gas to penetrate said firstconduit sections to fluidize material flowing in said passageways; andmeans for inducing flow of material in said passageways, causingmaterial introduced therein to be impelled through said passageway ofsaid first segment and selectively through said passageways of saidsecond and third segments.
 30. A transport line according to claim 29wherein said flow inducing means comprises a nozzle communicable with asource of gas under pressure.
 31. A transport line according to claim 29wherein said first segment includes a first section and a second sectiondisposed at an angle to said first section, and including means forinjecting air under pressure into the passageway of said first section.32. A system for pneumatically conveying a bulk particulate materialcomprising: means for holding said material, having an inlet and anoutlet; a first transport line segment including a material flowpassageway having an inlet communicating with said inlet of said holdingmeans and an outlet; a second transport line segment including amaterial flow passageway having an inlet communicating with said outletof said first transport line segment, and an outlet; said second segmentbeing displaceable relative to said first segment between a firstposition communicating said outlet of the material flow passagewaythereof with a receptacle into which said material is to be conveyed,and a second position communicating said outlet of said material flowpassageway thereof with said inlet of said material holding means; andmeans for inducing flow of material in said passageways, causingmaterial introduced therein from said holding means to be impelledtherethrough.
 33. A system according to claim 32 wherein said flowinducing means comprises a nozzle communicating with a source of gasunder pressure.
 34. A system according to claim 33 wherein said sourceof gas is operable to provide a gas under pressure in the range of 80 to120 psig.
 35. A system according to claim 32 wherein said first segmentincludes a first section and a second section disposed at an angle tosaid first section.
 36. A system according to claim 33 including meansfor injecting air under pressure into the passageway of said secondsection.
 37. A system according to claim 32 wherein said first segmentis permanently connected to said material holding means.
 38. A systemaccording to claim 32 including a valve disposed between said materialholding means and said first segment.
 39. A system according to claim 38wherein said valve is a rotary valve.
 40. A system according to claim 38wherein said valve is a slide valve.
 41. A system according to claim 32wherein said material holding means comprises a vessel.
 42. A systemaccording to claim 41 wherein said vessel includes an invertedfrusto-conically configured lower section.
 43. A system according toclaim 42 including means for fluidizing material disposed in said lowersection.
 44. A system according to claim 32 wherein said second segmentdisposed in one of said position may be detached from said first segmentand reattached to said first segment in said other position.
 45. Asystem according to claim 32 wherein said second segment is swivellyconnected to said first segment.
 46. A system for pneumaticallyconveying a bulk particulate material comprising: means for holding saidmaterial, having an inlet and an outlet; a first material transport linesegment including a material flow passageway having an inletcommunicating with said outlet of said material holding means; a secondmaterial transport line segment including a material flow passagewayhaving an inlet communicable with the outlet of the material fluidpassageway of said first segment; a third material transport linesegment including a material flow passageway having an inletcommunicable with the outlet of the material flow passageway of saidfirst segment and an outlet communicating with the inlet of saidmaterial holding means; means for selectively communicating saidmaterial flow passageway of said first segment with one of the materialflow passageways of said second and third segments; and means forinducing flow of material in said passageways, causing materialintroduced therein from said material holding means to be impelledthrough said passageway of said first segment and selectively throughsaid passageways of said second and third segments.